Use \cite and \bibitem to link up citations, even with citeproc.

See #9031 and discussion in #9020. This will give us better
accessibility; when tagging is enabled, the citation can be
linked to the bibliography entry.

This changes some of the details of the layout and the default
template. We now make CSLReferences a special enumitem list
that will contain `\bibitem`s.

Internal links inside citations to ids beginning in `ref-` are
put inside a `\cite` instead of `\hyperref`.

Closes #9031.

data/templates/default.latex

@@ -335,24 +335,28 @@ $if(pagestyle)$
 \pagestyle{$pagestyle$}
 $endif$
 $if(csl-refs)$
+% definitions for citeproc citations
+\NewDocumentCommand\citeproctext{}{}
+\NewDocumentCommand\citeproc{mm}{%
+  \begingroup\def\citeproctext{#2}\cite{#1}\endgroup}
+% avoid brackets around text for \cite:
+\makeatletter
+ \def\@biblabel#1{}
+ \def\@cite#1#2{{#1\if@tempswa , #2\fi}}
+\makeatother
 \newlength{\cslhangindent}
 \setlength{\cslhangindent}{1.5em}
 \newlength{\csllabelwidth}
 \setlength{\csllabelwidth}{3em}
-\newlength{\cslentryspacingunit} % times entry-spacing
-\setlength{\cslentryspacingunit}{\parskip}
-\newenvironment{CSLReferences}[2] % #1 hanging-ident, #2 entry spacing
- {% don't indent paragraphs
-  \setlength{\parindent}{0pt}
-  % turn on hanging indent if param 1 is 1
-  \ifodd #1
-  \let\oldpar\par
-  \def\par{\hangindent=\cslhangindent\oldpar}
-  \fi
-  % set entry spacing
-  \setlength{\parskip}{#2\cslentryspacingunit}
- }%
- {}
+\newlength{\cslentryspacing}
+\setlength{\cslentryspacing}{0em}
+\usepackage{enumitem}
+\newlist{CSLReferences}{itemize}{1}
+\setlist[CSLReferences]{label={},
+  leftmargin=\cslhangindent,
+  itemindent=-1\cslhangindent,
+  parsep=\parskip,
+  itemsep=\cslentryspacing}
 \usepackage{calc}
 \newcommand{\CSLBlock}[1]{#1\hfill\break}
 \newcommand{\CSLLeftMargin}[1]{\parbox[t]{\csllabelwidth}{#1}}